Metadata

Coordinates

37.94333, -121.5376278 (decimal degrees)

Elevation

4.57 m below sea level

Maps


Deployment Dates

Deployed: 2016-07-15
Removed: N/A

Sensors Deployed

  • 1 NRLITE2 (Kipp & Zonen) net radiometer mounted at approximately 1.8 m above ground level
  • 2 FW3 (Campbell Scientific) fine-wire thermocouples mounted at 1.5 m above ground level
  • 2 CS616 (Campbell Scientific) volumetric water content sensors

Notes

  • Surface renewal sensible heat flux measurements were corrected with calibration coefficients developed between surface renewal and eddy covariance measurements at Station D13 (Roberts Island Alfalfa).
  • Thermocouples at this station were wired incorrectly until 2016-09-07 15:00
  • At this point both Tn and Tc were rewired correctly
  • The data shown have the empirical correction applied to the sensible heat fluxes when the thermocouples were misswired (sign change in heat flux)

Photographs



Daily Evapotranspiration and Energy Balance Components

Summed daily net radiation (Rn), surface renewal derived sensible heat flux (H SR), and actual evapotranspiration (ETa SR) derived from the energy balance residual. Ground heat flux (G) was assumed negligible at the daily scale.

Columns plotted: Rn_Avg_gf_mm_Dqc, SR_aH_gf_mm_Dqc, ET_SR_gf_Dqc, ETo_mm


Daily ETa / ETo

Daily calculated ETa divided by daily ETo obtained from Spatial CIMIS.

Columns plotted: Ka_SR


Half-hourly Energy Balance Components

Average net radiation (Rn), and calibrated surface renewal derived sensible heat flux from each thermocouple (H Tc and H Tn), and the average of the sensible heat fluxes measured by each thermocouple (H SR).

Columns plotted: Rn_Avg_qc, SR_aH_qc, Tc_aH_qc, Tn_aH_qc


Half-hourly Average Uncalibrated Volumetric Water Content

Half-hourly Average uncalibrated volumetric water content measured by each CS616. Default calibration coefficients given by the instrument manufacturer were applied but lead to unrealistically high VWC seen here. This is likely due to differences between soils in the Delta and the soils the calibration was developed for. Processing of gravimetric moisture measurements that will be used to develop site specific calibrations are still ongoing. Nevertheless, the values presented here give a rough qualitative indication of relative changes in moisture over time and with depth.

Columns plotted: VW_1_qc, VW_2_qc


Half-hourly Average Temperature

Half-hourly Average temperature measured by each thermocouple (Tc and Tn) and by the internal datalogger reference.

Note that at this station thermocouples were wired incorrectly until the afternoon of 2016-09-07. At this point Tn was fixed, but Tc was left miswired to develop a correction to the sensible heat flux. Thermocouple temperatures before 2016-09-07 are not accurate, and only Tn is accurate afterwards. Since surface renewal uses changes in tempearture and not the temperatures themselves, accurate sensible heat fluxes were obtained from miswired thermocouples by applying a sign change.

Columns plotted: Tpanel_qc, Tc0_Avg_qc, Tn0_Avg_qc


Half-hourly Average Battery Voltage

Half-hourly datalogger battery voltage

Columns plotted: BattVolt_Avg_qc